Automatic lubricating system for internal-combustion-engine pistons



O. J. McGANN.

AUTOMATIC LUBRICATING SYSTEM FOR INTERNAL COMBUSTION ENGINE PISTONS.

I APPLICATION FILED MAY3I, I919- 1 ,347, 95 9 Patented uly 27, 1920.

Jill/61122;.

UNITED STATES PATENT OFFICE.

owEN J. MQGANN', or"ol'mnoLL'roN,'oHIo AUTOMATIC. LUBRICATING FOR',INTERNAL-COMBUSTION-ENGINE PISTONS.

' Specification of Letters Patent. P t t J ly 27, 2

Application filed May 31, 1919. Serial No. 301,074. 7

To all whom, it may concern:

Be itknown that I, OWEN J MCGANN, a citizen of the United States, residing at .Carrolltora in the .county of Carroll and State of hio, have invented certain new and useful Improvements. in Automatic Lubricating Systems forlnternal-Combustion-Engine Pistons; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

, This invention relates to an automatic lubricating system for internal combustion I engine pistons. I

An object of the lnvention resides in the provision of a devlce by means of which oil will be fed directly between the piston.

and the wall of the cylinder, periodically. A further object of the invention resides in the provision of means whereby the heat of the explosion in the combustion chamber will be prevented from destroying the oil between the piston and cylinder wall.

lVith these and other objects in View, such as will appear as my description progresses, my invention resides in the combination and arrangement of parts as set forth in and falling within the scope of the appended claims.

In the drawing:

Figure 1 is a sectional view of my device illustrating the relation of the same to the cylinder and piston; and

Fig. 2 is a transverse sectional view on line 2-2 of Fig. 1.

The cylinder 1 is of the usual form, and a piston 2 is operable within the cylinder. This piston is provided on its upper face with a non-heat conducting material which is in the form of a plate 2. This plate is maintained in place on the upper face of the piston by a suitable metallic plate 3 cylinder. 1 This casting is also providedwith a flange 10 between which and the wall'of the cylinder a castin 11 is disposed so as to make the joint fluid tight. 12 extends through the casting 7 and communicates with the interior of the cylinder at 13. This opening is circular in cross section, as illustrated in Fig. 2 of the drawing and in it a valve rod 14 is longitudinally slidable. This valve rod is, for a 'portion of its length, circularin cross section and for the remainder of its length it is triangular in cross section as'at 15, so that spaces 16 exist between the faces of the rod 14 and the wall of the opening. The longitudinal opening 12 is adapted to be closed at the cylinder end by a valve 17, which is carried by the end of the rod 14 and beyond which a cam 18 extends. This rod 14 is normally urged toward the piston, so that the normal tendency will be to open the valve 17, bya coil spring 18 which encircles the end of the rod 14 and bears at one end against a collar l9 on the rod and at the other end against the face of the cap 20 which is in screw-threaded engagement with the end of the body portion 7 of the casting. The spaces 16 are supplied with oil through an oil duct 21 which is itself supplied by a 7 pipe 22 from a suitable oil supply.

cam slot 5 in the piston is alined with the cam 18 on the rod 14, so that during the. travel of the piston the cam will be projected into the cam slot by the action of the spring 18.

In operation, as the piston reciprocates, each time the cam slot 5 passes-the cam 18, the cam will be projected into the slot by the action of the spring 18, and the valve 17 will be opened so that the oil in the spaces 16 between the rod 14 and the face of the opening 12 will flow into the cylinder. This oil will follow the groove 6 in the face of the piston, and since this groove extends completely around the periphery of the piston, the entire surface between the face of the piston and the wall of the cylinder will be lubricated. It will thus be seen that the oil fed I to the cylinder will be intermittent and because of this reason there will not be an excess of oil existing between the piston and the wall of. thecylinder. However, there will be sufficient oil for lubricating purposes and suflicient. oil to act as a seal. The presence of the non-heat conducting plate 2 on the upper end of the piston prevents to a great extent, the heating of the pistonby the explosion in the upper chamber, and because 7 of this action the body of the oil, Which" is' between the piston and cylinder, is I not broken down and consequently a more perfect lubrication anda longer life of the oil is insured. V

which is formed at 13.

It will be seen thatwhen'the valve is opened the oil will flow into the chamber Of course, at this time part of the oil'will passinto the groox' es 6 and lubricate the cylinder. When, however, the valve is closed some of the oil will remain in the chamberat 13 and when the valve is again opened that 011 w ll be forced ing oil fills the chamber.

into the groove 6 by the valve as the incom- "Thus there Will be,in.effect, a forced feed. 1 VJ hat I claim is: A 1; The combination with an internal combustion engine cylinder and piston, which latter is provided With a camslot in its face, of an oiling device attached to the cylinder and having an oil duct communicating with the interior thereof, a Valve for closing said duct, a cam'operable against the face of the piston to maintain said valve closed, and means for projectingthe cam into the cam slot to open the valve when the slot is alined With the cam. V

2. The combination with an internal combustion engine cylinder and piston, the piston having a peripheral groove therein, and

the cylinder having an oil "chamber therein,

of means for supplying the chamber with oil,and a springactuated piston controlled by the movements of-the piston forforcing the oil from the chamber into said groove.

In testimony whereof I-afiix my signature.

OWEN MCGANN. 

